Jinitm Technology More Than Patterns

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Jinitm TechnologyMore Than Patterns
Jim Waldo Jini Architect Sun Microsystems, Inc.
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Jini is a System

• Infrastructure
• Mobile objects
• Discovery/Join
• Lookup
• Programming model
• Services

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Patterns Make Sense

• Describe the programming model
• Alternate vocabulary
• Extend the programming model
• What other interactions make sense
• What has worked in other systems

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Jini requires infrastructure

• Leverage Javatm environment
• Portable binary code
• Dynamic loading
• Code verification
• Safe, typed language
• Ad-hoc networking requires this
• Stub code belongs to service
• Moves to client on demand
• New participants can implement VM

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Language Independence

• Unclear how to have a language-independent
• Type system
• Mobile objects
• In other languages, you lack
• VM for homogeneity
• Verification for safety
• Dynamic loading/class loaders

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Know What We are Doing

• Patterns won't allow
• Jini in other languages (that couldn't do it
  before)
• Language independence
• Interoperability with other systems
• Patterns will allow
• Enriching the programming model
• Allow better understanding